Shortcut　nitrification　sludge,　which　was　set　aside　for　two　months,　was　recovered　using　Reactors　,　,　,　and　.　The　aeration　rates　of　Reactors　,　,　,　and　were　120,　100,　80,　and　60　L•h-1,　respectively,　while　treating　real　domestic　sewage,　and　the　ratio　of　aerobic/anoxic　was　30　min/30　min　at　the　temperature　of　25.　The　influent　of　ammonia　was　50-80　mg•L-1,　and　the　concentration　of　effluent　ammonia　was　stable,　at　below　5　mg•L-1,　after　the　12th,　18th,　21st,　and　21st　cycles.　The　removal　ratio　of　ammonia　nitrogen　was　about　95%.　The　highest　concentrations　of　nitrite　for　Reactors　,　,　,　and　were　20.83,　22.81,　21.50,　and　20.73　mg•L-1,　respectively,　which　occurred　in　the　30th,　35th,　38th,　and　42nd　cycles,　respectively.　The　concentrations　of　effluent　nitrate　were　lower　than　0.5　mg•L-1,　and　the　nitrite　accumulation　rates　were　higher　than　99%.　The　activity　of　ammonia-oxidizing　bacteria　(AOB)　increased　gradually　and　finally　stabilized　at　100.00%;　however,　the　activity　of　nitrite-oxidizing　bacteria　(NOB)　was　gradually　inhibited.　The　recovery　of　shortcut　nitrification　was　achieved　successfully　in　the　different　aeration　modes.　©　2018,　Science　Press.　All　right　reserved.